Jack Dorsey is the founder and CEO of two major tech companies: Twitter and Square. Not only is today Jack’s 39th birthday but Square also had its IPO today on the New York Stock Exchange. He’s pictured here in Japan with his beautiful girlfriend Kate Greer. Photo from Twitter.

The billionaire has been dating Kate for the past five years. Photo from Instagram.

Kate made our list of 60 Most Beautiful Blondes in 2014. She is 30 years old and a graduate of the University of Missouri. Photo from Instagram.

Kate at a party with her friend Cleo Wade earlier this year at Joe’s Pub in NYC.